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He told NBC News: "I saw a lot of ex-military jump into gear and start plugging bullet-holes with their fingers.

"While everyone else was crouching I saw police officers standing up as targets, just trying to direct people and tell them where to go.

"The amount of bravery I saw there, words can't describe what it was like."

Speaking about the moment gunman Stephen Paddock opened fire, he added: "He was just spraying the crowd, it was relentless, there was no stopping, maybe five or eight seconds to move from cover to cover to try and get out as he reloaded."

Police say at least 58 people died and more than 515 were injured after Paddock, 64, attacked concertgoers with an "arsenal" of weapons from a room inside the Mandalay Bay Resort.

Karen Bernard, a retired teacher, added: "We heard shots fired, it sounded like firecrackers. We thought it was part of the concert.

"People were saying get down, get down and so we did. It was like mass havoc, panic; people were trampling over each other trying to get down.

"People were saying get behind the stage, get down and we crawled behind the stage. The shots started coming much louder and closer."

Describing their escape, she added: "We jumped behind the stage. Someone made a ramp up to the top of the wall - we crawled, jumped and they caught us. We didn't know where to go. There was just an exodus of people."